Communication method and apparatus

Abstract

This application relates to the communication field, and in particular, to a network access method and apparatus. The solutions may be applied to a communication system including a terminal that does not support non-access stratum signaling, for example, the terminal is an N5CW device, or may be applied to a communication system including a non-3GPP access network device, for example, the access network device is a TWAN device. In the method, an access network device may obtain an identifier of a home network of a terminal and an identifier of a target network. The identifier of the target network may be for determining an AMF, and the identifier of the home network may be for determining an AUSF, to ensure that the terminal can be successfully registered with a network when accessing the network through a non-3GPP access network device, so as to improve network access reliability.

What is claimed is: 
     
         1 . A communication method, applied to a first device, wherein the first device is a non-3rd generation partnership project (3GPP) access network device, and comprising:
 receiving first information from a second device, wherein the first information comprises first identification information, second identification information, and third identification information, the first identification information indicates the second device, the second identification information indicates a home network of the second device, and the third identification information indicates a target network of the second device;   determining an access and mobility management function device based on the third identification information;   sending registration request information to the access and mobility management function device, wherein the registration request information comprises the first identification information and the second identification information; and   receiving registration response information from the access and mobility management function device.   
     
     
         2 . The method according to  claim 1 , wherein network identifiers of the target network and the home network are different. 
     
     
         3 . The method according to  claim 1 , wherein the non-3rd generation partnership project (3GPP) access network device comprises a trusted wireless local area network access network device. 
     
     
         4 . The method according to  claim 3 , wherein the trusted wireless local area network access network device comprises:
 a trusted wireless local area network access point device and a trusted wireless local area network interworking function device.   
     
     
         5 . The method according to  claim 1 , wherein the method further comprises:
 generating the registration request information based on the first information.   
     
     
         6 . The method according to  claim 1 , wherein the first information further comprises:
 first indication information, wherein the first indication information indicates that the second device accesses the target network through a connection that does not support non-access stratum signaling.   
     
     
         7 . The method according to  claim 1 , wherein a format of the first information is a decorated network access identifier. 
     
     
         8 . The method according to  claim 1 , wherein the registration request information comprises information in a format of a network access identifier, and the information in the format of the network access identifier comprises the first identification information and the second identification information. 
     
     
         9 . A communication method, comprising:
 sending, by a second device, first information to a first device, wherein the first information comprises first identification information, second identification information, and third identification information, the first identification information indicates the second device, the second identification information indicates a home network of the second device, the third identification information indicates a target network of the second device, and the first device is a non-3rd generation partnership project (3GPP) access network device; and   determining, by the first device, an access and mobility management function device based on the third identification information, and sending registration request information to the access and mobility management function device, wherein the registration request information comprises the first identification information and the second identification information.   
     
     
         10 . The method according to  claim 9 , wherein the method further comprises:
 determining, by the access and mobility management function device, an authentication server function device based on the second identification information, and authenticating the second device; and   sending, by the access and mobility management function device, registration response information to the first device.   
     
     
         11 . The method according to  claim 9 , wherein network identifiers of the target network and the home network are different. 
     
     
         12 . The method according to  claim 9 , wherein the non-3rd generation partnership project (3GPP) access network device comprises a trusted wireless local area network access network device. 
     
     
         13 . The method according to  claim 12 , wherein the trusted wireless local area network access network device comprises:
 a trusted wireless local area network access point device and a trusted wireless local area network interworking function device.   
     
     
         14 . The method according to  claim 9 , wherein the method further comprises:
 generating, by the first device, the registration request information based on the first information.   
     
     
         15 . The method according to  claim 9 , wherein the first information further comprises:
 first indication information, wherein the first indication information indicates that the second device accesses the target network through a connection that does not support non-access stratum signaling.   
     
     
         16 . The method according to  claim 9 , wherein a format of the first information is a decorated network access identifier. 
     
     
         17 . The method according to  claim 9 , wherein the registration request information comprises information in a format of a network access identifier, and the information in the format of the network access identifier comprises the first identification information and the second identification information. 
     
     
         18 . An apparatus, comprising:
 a memory configured to store instructions; and   one or more processors coupled to the memory and configured to execute the instructions to:   receive first information from a second device, wherein the first information comprises first identification information, second identification information, and third identification information, the first identification information indicates the second device, the second identification information indicates a home network of the second device, and the third identification information indicates a target network of the second device;   determine an access and mobility management function device based on the third identification information;   send registration request information to the access and mobility management function device, wherein the registration request information comprises the first identification information and the second identification information; and   receive registration response information from the access and mobility management function device.